SAFE public projects git trees. - safe/jmp/linux-2.6/blob - crypto/algapi.c

   1 /*
   2  * Cryptographic API for algorithms (i.e., low-level API).
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/string.h>
  21
  22 #include "internal.h"
  23
  24 static void crypto_remove_final(struct list_head *list);
  25
  26 static LIST_HEAD(crypto_template_list);
  27
  28 void crypto_larval_error(const char *name, u32 type, u32 mask)
  29 {
  30         struct crypto_alg *alg;
  31
  32         alg = crypto_alg_lookup(name, type, mask);
  33
  34         if (alg) {
  35                 if (crypto_is_larval(alg)) {
  36                         struct crypto_larval *larval = (void *)alg;
  37                         complete_all(&larval->completion);
  38                 }
  39                 crypto_mod_put(alg);
  40         }
  41 }
  42 EXPORT_SYMBOL_GPL(crypto_larval_error);
  43
  44 static inline int crypto_set_driver_name(struct crypto_alg *alg)
  45 {
  46         static const char suffix[] = "-generic";
  47         char *driver_name = alg->cra_driver_name;
  48         int len;
  49
  50         if (*driver_name)
  51                 return 0;
  52
  53         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
  54         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
  55                 return -ENAMETOOLONG;
  56
  57         memcpy(driver_name + len, suffix, sizeof(suffix));
  58         return 0;
  59 }
  60
  61 static int crypto_check_alg(struct crypto_alg *alg)
  62 {
  63         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  64                 return -EINVAL;
  65
  66         if (alg->cra_blocksize > PAGE_SIZE / 8)
  67                 return -EINVAL;
  68
  69         if (alg->cra_priority < 0)
  70                 return -EINVAL;
  71
  72         return crypto_set_driver_name(alg);
  73 }
  74
  75 static void crypto_destroy_instance(struct crypto_alg *alg)
  76 {
  77         struct crypto_instance *inst = (void *)alg;
  78         struct crypto_template *tmpl = inst->tmpl;
  79
  80         tmpl->free(inst);
  81         crypto_tmpl_put(tmpl);
  82 }
  83
  84 static void crypto_remove_spawn(struct crypto_spawn *spawn,
  85                                 struct list_head *list,
  86                                 struct list_head *secondary_spawns)
  87 {
  88         struct crypto_instance *inst = spawn->inst;
  89         struct crypto_template *tmpl = inst->tmpl;
  90
  91         list_del_init(&spawn->list);
  92         spawn->alg = NULL;
  93
  94         if (crypto_is_dead(&inst->alg))
  95                 return;
  96
  97         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
  98         if (hlist_unhashed(&inst->list))
  99                 return;
 100
 101         if (!tmpl || !crypto_tmpl_get(tmpl))
 102                 return;
 103
 104         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
 105         list_move(&inst->alg.cra_list, list);
 106         hlist_del(&inst->list);
 107         inst->alg.cra_destroy = crypto_destroy_instance;
 108
 109         list_splice(&inst->alg.cra_users, secondary_spawns);
 110 }
 111
 112 static void crypto_remove_spawns(struct list_head *spawns,
 113                                  struct list_head *list, u32 new_type)
 114 {
 115         struct crypto_spawn *spawn, *n;
 116         LIST_HEAD(secondary_spawns);
 117
 118         list_for_each_entry_safe(spawn, n, spawns, list) {
 119                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 120                         continue;
 121
 122                 crypto_remove_spawn(spawn, list, &secondary_spawns);
 123         }
 124
 125         while (!list_empty(&secondary_spawns)) {
 126                 list_for_each_entry_safe(spawn, n, &secondary_spawns, list)
 127                         crypto_remove_spawn(spawn, list, &secondary_spawns);
 128         }
 129 }
 130
 131 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 132 {
 133         struct crypto_alg *q;
 134         struct crypto_larval *larval;
 135         int ret = -EAGAIN;
 136
 137         if (crypto_is_dead(alg))
 138                 goto err;
 139
 140         INIT_LIST_HEAD(&alg->cra_users);
 141
 142         /* No cheating! */
 143         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 144
 145         ret = -EEXIST;
 146
 147         atomic_set(&alg->cra_refcnt, 1);
 148         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 149                 if (q == alg)
 150                         goto err;
 151
 152                 if (crypto_is_moribund(q))
 153                         continue;
 154
 155                 if (crypto_is_larval(q)) {
 156                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 157                                 goto err;
 158                         continue;
 159                 }
 160
 161                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 162                     !strcmp(q->cra_name, alg->cra_driver_name))
 163                         goto err;
 164         }
 165
 166         larval = crypto_larval_alloc(alg->cra_name,
 167                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 168         if (IS_ERR(larval))
 169                 goto out;
 170
 171         ret = -ENOENT;
 172         larval->adult = crypto_mod_get(alg);
 173         if (!larval->adult)
 174                 goto free_larval;
 175
 176         atomic_set(&larval->alg.cra_refcnt, 1);
 177         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 178                CRYPTO_MAX_ALG_NAME);
 179         larval->alg.cra_priority = alg->cra_priority;
 180
 181         list_add(&alg->cra_list, &crypto_alg_list);
 182         list_add(&larval->alg.cra_list, &crypto_alg_list);
 183
 184 out:
 185         return larval;
 186
 187 free_larval:
 188         kfree(larval);
 189 err:
 190         larval = ERR_PTR(ret);
 191         goto out;
 192 }
 193
 194 void crypto_alg_tested(const char *name, int err)
 195 {
 196         struct crypto_larval *test;
 197         struct crypto_alg *alg;
 198         struct crypto_alg *q;
 199         LIST_HEAD(list);
 200
 201         down_write(&crypto_alg_sem);
 202         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 203                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 204                         continue;
 205
 206                 test = (struct crypto_larval *)q;
 207
 208                 if (!strcmp(q->cra_driver_name, name))
 209                         goto found;
 210         }
 211
 212         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
 213         goto unlock;
 214
 215 found:
 216         q->cra_flags |= CRYPTO_ALG_DEAD;
 217         alg = test->adult;
 218         if (err || list_empty(&alg->cra_list))
 219                 goto complete;
 220
 221         alg->cra_flags |= CRYPTO_ALG_TESTED;
 222
 223         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 224                 if (q == alg)
 225                         continue;
 226
 227                 if (crypto_is_moribund(q))
 228                         continue;
 229
 230                 if (crypto_is_larval(q)) {
 231                         struct crypto_larval *larval = (void *)q;
 232
 233                         /*
 234                          * Check to see if either our generic name or
 235                          * specific name can satisfy the name requested
 236                          * by the larval entry q.
 237                          */
 238                         if (strcmp(alg->cra_name, q->cra_name) &&
 239                             strcmp(alg->cra_driver_name, q->cra_name))
 240                                 continue;
 241
 242                         if (larval->adult)
 243                                 continue;
 244                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 245                                 continue;
 246                         if (!crypto_mod_get(alg))
 247                                 continue;
 248
 249                         larval->adult = alg;
 250                         complete_all(&larval->completion);
 251                         continue;
 252                 }
 253
 254                 if (strcmp(alg->cra_name, q->cra_name))
 255                         continue;
 256
 257                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 258                     q->cra_priority > alg->cra_priority)
 259                         continue;
 260
 261                 crypto_remove_spawns(&q->cra_users, &list, alg->cra_flags);
 262         }
 263
 264 complete:
 265         complete_all(&test->completion);
 266
 267 unlock:
 268         up_write(&crypto_alg_sem);
 269
 270         crypto_remove_final(&list);
 271 }
 272 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 273
 274 static void crypto_remove_final(struct list_head *list)
 275 {
 276         struct crypto_alg *alg;
 277         struct crypto_alg *n;
 278
 279         list_for_each_entry_safe(alg, n, list, cra_list) {
 280                 list_del_init(&alg->cra_list);
 281                 crypto_alg_put(alg);
 282         }
 283 }
 284
 285 static void crypto_wait_for_test(struct crypto_larval *larval)
 286 {
 287         int err;
 288
 289         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 290         if (err != NOTIFY_STOP) {
 291                 if (WARN_ON(err != NOTIFY_DONE))
 292                         goto out;
 293                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 294         }
 295
 296         err = wait_for_completion_interruptible(&larval->completion);
 297         WARN_ON(err);
 298
 299 out:
 300         crypto_larval_kill(&larval->alg);
 301 }
 302
 303 int crypto_register_alg(struct crypto_alg *alg)
 304 {
 305         struct crypto_larval *larval;
 306         int err;
 307
 308         err = crypto_check_alg(alg);
 309         if (err)
 310                 return err;
 311
 312         down_write(&crypto_alg_sem);
 313         larval = __crypto_register_alg(alg);
 314         up_write(&crypto_alg_sem);
 315
 316         if (IS_ERR(larval))
 317                 return PTR_ERR(larval);
 318
 319         crypto_wait_for_test(larval);
 320         return 0;
 321 }
 322 EXPORT_SYMBOL_GPL(crypto_register_alg);
 323
 324 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 325 {
 326         if (unlikely(list_empty(&alg->cra_list)))
 327                 return -ENOENT;
 328
 329         alg->cra_flags |= CRYPTO_ALG_DEAD;
 330
 331         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
 332         list_del_init(&alg->cra_list);
 333         crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags);
 334
 335         return 0;
 336 }
 337
 338 int crypto_unregister_alg(struct crypto_alg *alg)
 339 {
 340         int ret;
 341         LIST_HEAD(list);
 342
 343         down_write(&crypto_alg_sem);
 344         ret = crypto_remove_alg(alg, &list);
 345         up_write(&crypto_alg_sem);
 346
 347         if (ret)
 348                 return ret;
 349
 350         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
 351         if (alg->cra_destroy)
 352                 alg->cra_destroy(alg);
 353
 354         crypto_remove_final(&list);
 355         return 0;
 356 }
 357 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 358
 359 int crypto_register_template(struct crypto_template *tmpl)
 360 {
 361         struct crypto_template *q;
 362         int err = -EEXIST;
 363
 364         down_write(&crypto_alg_sem);
 365
 366         list_for_each_entry(q, &crypto_template_list, list) {
 367                 if (q == tmpl)
 368                         goto out;
 369         }
 370
 371         list_add(&tmpl->list, &crypto_template_list);
 372         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
 373         err = 0;
 374 out:
 375         up_write(&crypto_alg_sem);
 376         return err;
 377 }
 378 EXPORT_SYMBOL_GPL(crypto_register_template);
 379
 380 void crypto_unregister_template(struct crypto_template *tmpl)
 381 {
 382         struct crypto_instance *inst;
 383         struct hlist_node *p, *n;
 384         struct hlist_head *list;
 385         LIST_HEAD(users);
 386
 387         down_write(&crypto_alg_sem);
 388
 389         BUG_ON(list_empty(&tmpl->list));
 390         list_del_init(&tmpl->list);
 391
 392         list = &tmpl->instances;
 393         hlist_for_each_entry(inst, p, list, list) {
 394                 int err = crypto_remove_alg(&inst->alg, &users);
 395                 BUG_ON(err);
 396         }
 397
 398         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
 399
 400         up_write(&crypto_alg_sem);
 401
 402         hlist_for_each_entry_safe(inst, p, n, list, list) {
 403                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
 404                 tmpl->free(inst);
 405         }
 406         crypto_remove_final(&users);
 407 }
 408 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 409
 410 static struct crypto_template *__crypto_lookup_template(const char *name)
 411 {
 412         struct crypto_template *q, *tmpl = NULL;
 413
 414         down_read(&crypto_alg_sem);
 415         list_for_each_entry(q, &crypto_template_list, list) {
 416                 if (strcmp(q->name, name))
 417                         continue;
 418                 if (unlikely(!crypto_tmpl_get(q)))
 419                         continue;
 420
 421                 tmpl = q;
 422                 break;
 423         }
 424         up_read(&crypto_alg_sem);
 425
 426         return tmpl;
 427 }
 428
 429 struct crypto_template *crypto_lookup_template(const char *name)
 430 {
 431         return try_then_request_module(__crypto_lookup_template(name), name);
 432 }
 433 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 434
 435 int crypto_register_instance(struct crypto_template *tmpl,
 436                              struct crypto_instance *inst)
 437 {
 438         struct crypto_larval *larval;
 439         int err;
 440
 441         err = crypto_check_alg(&inst->alg);
 442         if (err)
 443                 goto err;
 444
 445         inst->alg.cra_module = tmpl->module;
 446
 447         down_write(&crypto_alg_sem);
 448
 449         larval = __crypto_register_alg(&inst->alg);
 450         if (IS_ERR(larval))
 451                 goto unlock;
 452
 453         hlist_add_head(&inst->list, &tmpl->instances);
 454         inst->tmpl = tmpl;
 455
 456 unlock:
 457         up_write(&crypto_alg_sem);
 458
 459         err = PTR_ERR(larval);
 460         if (IS_ERR(larval))
 461                 goto err;
 462
 463         crypto_wait_for_test(larval);
 464         err = 0;
 465
 466 err:
 467         return err;
 468 }
 469 EXPORT_SYMBOL_GPL(crypto_register_instance);
 470
 471 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 472                       struct crypto_instance *inst, u32 mask)
 473 {
 474         int err = -EAGAIN;
 475
 476         spawn->inst = inst;
 477         spawn->mask = mask;
 478
 479         down_write(&crypto_alg_sem);
 480         if (!crypto_is_moribund(alg)) {
 481                 list_add(&spawn->list, &alg->cra_users);
 482                 spawn->alg = alg;
 483                 err = 0;
 484         }
 485         up_write(&crypto_alg_sem);
 486
 487         return err;
 488 }
 489 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 490
 491 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 492                        struct crypto_instance *inst,
 493                        const struct crypto_type *frontend)
 494 {
 495         int err = -EINVAL;
 496
 497         if (frontend && (alg->cra_flags ^ frontend->type) & frontend->maskset)
 498                 goto out;
 499
 500         spawn->frontend = frontend;
 501         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 502
 503 out:
 504         return err;
 505 }
 506 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 507
 508 void crypto_drop_spawn(struct crypto_spawn *spawn)
 509 {
 510         down_write(&crypto_alg_sem);
 511         list_del(&spawn->list);
 512         up_write(&crypto_alg_sem);
 513 }
 514 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 515
 516 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 517 {
 518         struct crypto_alg *alg;
 519         struct crypto_alg *alg2;
 520
 521         down_read(&crypto_alg_sem);
 522         alg = spawn->alg;
 523         alg2 = alg;
 524         if (alg2)
 525                 alg2 = crypto_mod_get(alg2);
 526         up_read(&crypto_alg_sem);
 527
 528         if (!alg2) {
 529                 if (alg)
 530                         crypto_shoot_alg(alg);
 531                 return ERR_PTR(-EAGAIN);
 532         }
 533
 534         return alg;
 535 }
 536
 537 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 538                                     u32 mask)
 539 {
 540         struct crypto_alg *alg;
 541         struct crypto_tfm *tfm;
 542
 543         alg = crypto_spawn_alg(spawn);
 544         if (IS_ERR(alg))
 545                 return ERR_CAST(alg);
 546
 547         tfm = ERR_PTR(-EINVAL);
 548         if (unlikely((alg->cra_flags ^ type) & mask))
 549                 goto out_put_alg;
 550
 551         tfm = __crypto_alloc_tfm(alg, type, mask);
 552         if (IS_ERR(tfm))
 553                 goto out_put_alg;
 554
 555         return tfm;
 556
 557 out_put_alg:
 558         crypto_mod_put(alg);
 559         return tfm;
 560 }
 561 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 562
 563 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 564 {
 565         struct crypto_alg *alg;
 566         struct crypto_tfm *tfm;
 567
 568         alg = crypto_spawn_alg(spawn);
 569         if (IS_ERR(alg))
 570                 return ERR_CAST(alg);
 571
 572         tfm = crypto_create_tfm(alg, spawn->frontend);
 573         if (IS_ERR(tfm))
 574                 goto out_put_alg;
 575
 576         return tfm;
 577
 578 out_put_alg:
 579         crypto_mod_put(alg);
 580         return tfm;
 581 }
 582 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 583
 584 int crypto_register_notifier(struct notifier_block *nb)
 585 {
 586         return blocking_notifier_chain_register(&crypto_chain, nb);
 587 }
 588 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 589
 590 int crypto_unregister_notifier(struct notifier_block *nb)
 591 {
 592         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 593 }
 594 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 595
 596 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 597 {
 598         struct rtattr *rta = tb[0];
 599         struct crypto_attr_type *algt;
 600
 601         if (!rta)
 602                 return ERR_PTR(-ENOENT);
 603         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 604                 return ERR_PTR(-EINVAL);
 605         if (rta->rta_type != CRYPTOA_TYPE)
 606                 return ERR_PTR(-EINVAL);
 607
 608         algt = RTA_DATA(rta);
 609
 610         return algt;
 611 }
 612 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 613
 614 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 615 {
 616         struct crypto_attr_type *algt;
 617
 618         algt = crypto_get_attr_type(tb);
 619         if (IS_ERR(algt))
 620                 return PTR_ERR(algt);
 621
 622         if ((algt->type ^ type) & algt->mask)
 623                 return -EINVAL;
 624
 625         return 0;
 626 }
 627 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 628
 629 const char *crypto_attr_alg_name(struct rtattr *rta)
 630 {
 631         struct crypto_attr_alg *alga;
 632
 633         if (!rta)
 634                 return ERR_PTR(-ENOENT);
 635         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 636                 return ERR_PTR(-EINVAL);
 637         if (rta->rta_type != CRYPTOA_ALG)
 638                 return ERR_PTR(-EINVAL);
 639
 640         alga = RTA_DATA(rta);
 641         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 642
 643         return alga->name;
 644 }
 645 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 646
 647 struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask)
 648 {
 649         const char *name;
 650         int err;
 651
 652         name = crypto_attr_alg_name(rta);
 653         err = PTR_ERR(name);
 654         if (IS_ERR(name))
 655                 return ERR_PTR(err);
 656
 657         return crypto_alg_mod_lookup(name, type, mask);
 658 }
 659 EXPORT_SYMBOL_GPL(crypto_attr_alg);
 660
 661 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 662 {
 663         struct crypto_attr_u32 *nu32;
 664
 665         if (!rta)
 666                 return -ENOENT;
 667         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 668                 return -EINVAL;
 669         if (rta->rta_type != CRYPTOA_U32)
 670                 return -EINVAL;
 671
 672         nu32 = RTA_DATA(rta);
 673         *num = nu32->num;
 674
 675         return 0;
 676 }
 677 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 678
 679 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 680                              unsigned int head)
 681 {
 682         struct crypto_instance *inst;
 683         char *p;
 684         int err;
 685
 686         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 687                     GFP_KERNEL);
 688         if (!p)
 689                 return ERR_PTR(-ENOMEM);
 690
 691         inst = (void *)(p + head);
 692
 693         err = -ENAMETOOLONG;
 694         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 695                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 696                 goto err_free_inst;
 697
 698         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 699                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 700                 goto err_free_inst;
 701
 702         return p;
 703
 704 err_free_inst:
 705         kfree(p);
 706         return ERR_PTR(err);
 707 }
 708 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
 709
 710 struct crypto_instance *crypto_alloc_instance(const char *name,
 711                                               struct crypto_alg *alg)
 712 {
 713         struct crypto_instance *inst;
 714         struct crypto_spawn *spawn;
 715         int err;
 716
 717         inst = crypto_alloc_instance2(name, alg, 0);
 718         if (IS_ERR(inst))
 719                 goto out;
 720
 721         spawn = crypto_instance_ctx(inst);
 722         err = crypto_init_spawn(spawn, alg, inst,
 723                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 724
 725         if (err)
 726                 goto err_free_inst;
 727
 728         return inst;
 729
 730 err_free_inst:
 731         kfree(inst);
 732         inst = ERR_PTR(err);
 733
 734 out:
 735         return inst;
 736 }
 737 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 738
 739 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 740 {
 741         INIT_LIST_HEAD(&queue->list);
 742         queue->backlog = &queue->list;
 743         queue->qlen = 0;
 744         queue->max_qlen = max_qlen;
 745 }
 746 EXPORT_SYMBOL_GPL(crypto_init_queue);
 747
 748 int crypto_enqueue_request(struct crypto_queue *queue,
 749                            struct crypto_async_request *request)
 750 {
 751         int err = -EINPROGRESS;
 752
 753         if (unlikely(queue->qlen >= queue->max_qlen)) {
 754                 err = -EBUSY;
 755                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
 756                         goto out;
 757                 if (queue->backlog == &queue->list)
 758                         queue->backlog = &request->list;
 759         }
 760
 761         queue->qlen++;
 762         list_add_tail(&request->list, &queue->list);
 763
 764 out:
 765         return err;
 766 }
 767 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 768
 769 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 770 {
 771         struct list_head *request;
 772
 773         if (unlikely(!queue->qlen))
 774                 return NULL;
 775
 776         queue->qlen--;
 777
 778         if (queue->backlog != &queue->list)
 779                 queue->backlog = queue->backlog->next;
 780
 781         request = queue->list.next;
 782         list_del(request);
 783
 784         return list_entry(request, struct crypto_async_request, list);
 785 }
 786 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 787
 788 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
 789 {
 790         struct crypto_async_request *req;
 791
 792         list_for_each_entry(req, &queue->list, list) {
 793                 if (req->tfm == tfm)
 794                         return 1;
 795         }
 796
 797         return 0;
 798 }
 799 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
 800
 801 static inline void crypto_inc_byte(u8 *a, unsigned int size)
 802 {
 803         u8 *b = (a + size);
 804         u8 c;
 805
 806         for (; size; size--) {
 807                 c = *--b + 1;
 808                 *b = c;
 809                 if (c)
 810                         break;
 811         }
 812 }
 813
 814 void crypto_inc(u8 *a, unsigned int size)
 815 {
 816         __be32 *b = (__be32 *)(a + size);
 817         u32 c;
 818
 819         for (; size >= 4; size -= 4) {
 820                 c = be32_to_cpu(*--b) + 1;
 821                 *b = cpu_to_be32(c);
 822                 if (c)
 823                         return;
 824         }
 825
 826         crypto_inc_byte(a, size);
 827 }
 828 EXPORT_SYMBOL_GPL(crypto_inc);
 829
 830 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
 831 {
 832         for (; size; size--)
 833                 *a++ ^= *b++;
 834 }
 835
 836 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 837 {
 838         u32 *a = (u32 *)dst;
 839         u32 *b = (u32 *)src;
 840
 841         for (; size >= 4; size -= 4)
 842                 *a++ ^= *b++;
 843
 844         crypto_xor_byte((u8 *)a, (u8 *)b, size);
 845 }
 846 EXPORT_SYMBOL_GPL(crypto_xor);
 847
 848 static int __init crypto_algapi_init(void)
 849 {
 850         crypto_init_proc();
 851         return 0;
 852 }
 853
 854 static void __exit crypto_algapi_exit(void)
 855 {
 856         crypto_exit_proc();
 857 }
 858
 859 module_init(crypto_algapi_init);
 860 module_exit(crypto_algapi_exit);
 861
 862 MODULE_LICENSE("GPL");
 863 MODULE_DESCRIPTION("Cryptographic algorithms API");